#!/bin/sh

# Generate host keys if they are not already present. Taken from sshd
# initscript.
KEYGEN=/usr/bin/ssh-keygen
SSHD=/usr/sbin/sshd
RSA1_KEY=/etc/ssh/ssh_host_key
RSA_KEY=/etc/ssh/ssh_host_rsa_key
DSA_KEY=/etc/ssh/ssh_host_dsa_key
ECDSA_KEY=/etc/ssh/ssh_host_ecdsa_key
ED25519_KEY=/etc/ssh/ssh_host_ed25519_key

do_rsa1_keygen() {
    if [ ! -s $RSA1_KEY ]; then
        echo -n $"Generating SSH1 RSA host key: "
        if $KEYGEN -q -t rsa1 -f $RSA1_KEY -C '' -N '' >&/dev/null; then
            chmod 600 $RSA1_KEY
            chmod 644 $RSA1_KEY.pub
            echo "Success: RSA1 key generation"
            echo
        else
            echo "Failure: RSA1 key generation"
            echo
            exit 1
        fi
    fi
}

do_rsa_keygen() {
    if [ ! -s $RSA_KEY ]; then
        echo -n $"Generating SSH2 RSA host key: "
        if $KEYGEN -q -t rsa -b 4096 -f $RSA_KEY -C '' -N '' >&/dev/null; then
            chmod 600 $RSA_KEY
            chmod 644 $RSA_KEY.pub
            echo "Success: RSA key generation"
            echo
        else
            echo "Failure: RSA key generation"
            echo
            exit 1
        fi
    fi
}
do_dsa_keygen() {
    if [ ! -s $DSA_KEY ]; then
        echo -n $"Generating SSH2 DSA host key: "
        if $KEYGEN -q -t dsa -f $DSA_KEY -C '' -N '' >&/dev/null; then
            chmod 600 $DSA_KEY
            chmod 644 $DSA_KEY.pub
            echo "Success: DSA key generation"
            echo
        else
            echo "Failure: DSA key generation"
            echo
            exit 1
        fi
    fi
}

do_ecdsa_keygen() {
    if [ ! -s $ECDSA_KEY ]; then
        echo -n $"Generating SSH2 ECDSA host key: "
        if $KEYGEN -q -t ecdsa -b 521 -f $ECDSA_KEY -C '' -N '' >&/dev/null; then
            chmod 600 $ECDSA_KEY
            chmod 644 $ECDSA_KEY.pub
            echo "Success: ECDSA key generation"
            echo
        else
            echo "Failure: ECDSA key generation"
            echo
            exit 1
        fi
    fi
}

do_ed25519_keygen() {
    if [ ! -s $ED25519_KEY ]; then
        echo -n $"Generating SSH2 ED25519 host key: "
        if $KEYGEN -q -t ed25519 -f $ED25519_KEY -C '' -N '' >&/dev/null; then
            chmod 600 $ED25519_KEY
            chmod 644 $ED25519_KEY.pub
            echo "Success: ED25519 key generation"
            echo
        else
            echo "Failure: ED25519 key generation"
            echo
            exit 1
        fi
    fi
}

do_rsa1_keygen
do_rsa_keygen
do_dsa_keygen
do_ecdsa_keygen
do_ed25519_keygen
exit 0;